Add PepperTryCatch and V8ObjectVar classes

ppapi/shared_impl/var.h

Index: ppapi/shared_impl/var.h
diff --git a/ppapi/shared_impl/var.h b/ppapi/shared_impl/var.h
index d5a7a558297864be219303fc656cb94f47999f31..fcca41a9f95c82d7ea92d35de1dbe18529bf12f1 100644
--- a/ppapi/shared_impl/var.h
+++ b/ppapi/shared_impl/var.h
@@ -23,6 +23,7 @@ class NPObjectVar;
 class ProxyObjectVar;
 class ResourceVar;
 class StringVar;
+class V8ObjectVar;
 class VarTracker;
 
 // Var -------------------------------------------------------------------------
@@ -36,6 +37,7 @@ class PPAPI_SHARED_EXPORT Var : public base::RefCounted<Var> {
   virtual StringVar* AsStringVar();
   virtual ArrayBufferVar* AsArrayBufferVar();
   virtual NPObjectVar* AsNPObjectVar();
+  virtual V8ObjectVar* AsV8ObjectVar();
   virtual ProxyObjectVar* AsProxyObjectVar();
   virtual ArrayVar* AsArrayVar();
   virtual DictionaryVar* AsDictionaryVar();